The study began two months after an earthquake and tsunami devastated swaths of northeastern Japan in March 2011, triggering a nuclear disaster. The Fukushima Daiichi plant spewed radiation and displaced tens of thousands of residents from the surrounding area in the worst nuclear accident since the 1986 Chernobyl disaster in Ukraine.

In May 2011, researchers collected more than 100 pale grass blue butterflies in and around the Fukushima prefecture and found that 12% of them had abnormalities or mutations. When those butterflies mated, the rate of mutations in the offspring rose to 18%, according to the study, which added that some died before reaching adulthood. When the offspring mated with healthy butterflies that weren't affected by the nuclear crisis, the abnormality rate rose to 34%, indicating that the mutations were being passed on through genes to offspring at high rates even when one of the parent butterflies was healthy.

The scientists wanted to find out how things stood after a longer amount of time and again collected more than 200 butterflies last September. Twenty-eight percent of the butterflies showed abnormalities, but the rate of mutated offspring jumped to 52%, according to researchers. The study indicated that second-generation butterflies, the ones collected in September, likely saw higher numbers of mutations because they were exposed to the radiation either as larvae or earlier than adult butterflies first collected.

To make sure that the nuclear disaster was in fact the cause of the mutations, researchers collected butterflies that had not been affected by radiation and gave them low-dose exposures of radiation and found similar results.

"We conclude that artificial radionuclides from the Fukushima Nuclear Power Plant caused physiological and genetic damage to this species," the study said.

The results of the study bring up concerns about the larger impact of the Fukushima disaster and the impact it will have on the ecosystem in Japan and nearby areas, as well as what we can learn for future nuclear disasters.

"Our results are consistent with the previous field studies that showed that butterfly populations are highly sensitive to artificial radionuclide contamination in Chernobyl and Fukushima," the study said. "Together, the present study indicates that the pale grass blue butterfly is probably one of the best indicator species for radionuclide contamination in Japan."

One of the researchers, Joji Otaki, an associate professor at the University of the Ryukyus in Okinawa, told reporters that while butterflies may be the best indicator, the study should also lead to more research on what else may be affected by the radiation.

soundoff(316 Responses)

jack frost

The Mothra Song!! Now together everyone: 1, 2, 3.......

Mothra oh Mothra
Hear our call for you to save us
over time, over sea
like a wave you come
our guardian angel
Mothra oh Mothra
the people have forgotten kindness
their spirit falls to ruin
we shall pray for the people as we sing
this song of love

Cool! I bet to a butterfly collector, these would be an excellent addition to his collection. And the scientific community would love to examine these in detail. And....Oh yeah, I guess nuclear reactors are bad and stuff too.

You wouldn't be singing your stupid Mothra song if the nuclear disaster happened near you, tiny brained man missing a heart. Amazing how the thoughtless racists come out in droves in response to news articles. Speaking of mutations.

BigHwasdemo – mutations due to human contamination is not part of natural selection. as stated in the article, the mutations are significantly accelerated causing a large percentage of the butterflies to not even mature to adulthood.

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